coale



\ SLeeZ'YE SZ'LeeZ' wie. 326622712 @276m Zof Safely-Mire S "722 40 P02 Zen ea? Zeg/r. /Z/67.l

www?,

@www

MH W www A o/O wpm 7, im m Wu/ nwe@ a; www y .m WV ,w. ,m .e .6J/ j. www wm @fam www ma@ a .Mw @w 7 6 .m no

HENRY TAYLOR AND JOSEPH M, COALE, OF BALTIMORE, i MARYLAND.

" Letters Patent No. 72,240, dated December I7, 1867.

IMPROVEMENT IN STEAM-GENERATOR SAFETY-VALVES.

TO ALL WHOM IT MAY CONCERN:

Beit known that we, HENRY TAYLOR and JOSEPH M.v COALE, ofthe city and county of Baltimore, and State of Maryland, have invented certain new and useful improvements in what we term Steam-Locked Automatic Safety-Valves; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had tothe accompanying drawings, making a part of this specification, in which- Figure 1 represents a vertical central section through the safcty-valvc, showing its interior arrangement.

Figure 2 represents an end or top view of theyi'elding valve.

Figures 3 and 4 represent horizontal sections through the case, which Show the shape and position of the openings therein.

Similar letters of reference, where they occur in the separate figures, denote like part's of the-safety-valvc in all of the drawings. i v i Our invention relates to a safety-valve for steam-boilers, which will blow oil` at any pressure for which it may be set automatically, and which the attendant can cause to blow off or escape steam at any time, but which he cannot weight down, or prevent from escaping steam at the pressure for which it was originally set before it was closed up, and is therefore beyond his reach, and cannot be tampered with byvhim for increasing the pressure in the boiler beyond a given point.

To enable others skilled in the art to make and use our invention, we will proceed to describe the same with reference to the drawings.

A represents a case or dome, which for convenience in making,pplacing, removing, or repairing the interior, maybe divided into two parts, viz, an upper one, a, and a lower one, b, which are held together by the screwbolts B. This case or dome is fastened to the steam-boiler in any of the lusual well-known Ways, and its interior is always in connection with the steam in the steam-boiler. In the lower portion of the interior of the case'or dome A, there is suspended by a valve or valve-rod, C, a weight, D, the two being united by a, spring, e, or other yielding connection, so that the rolling of the-vessel, or the swaying motion of 'a locomotive, may not bind the valve-stem or prevent it from properly operating. The weight D and 7the valve C are first computed for the amount of pressure that thc 'safety-valve is to bear before it blows oi, and when this is calculated, and the' weight and valve enclosed in-the case, neither can be changed or tampered with, but the engineer or attendant can at any time test the valve, to see that it is operating right, by turning the rod E by means of the hand-lever F, there being a crank or wrist-pin, d, inside of the case, and on the rod or shaft to which a lifting-arm, G, Y

is connected; said lifting-arm raising the weight D, as also the valve C, which allows the steam to escape through the passages H H to the open air. By turning the lever F down, as shown in iig. 1, the weight again drops and the valve C comes to its seat. Through openings I I, Ste., tig. 3, which communicate with the interior of the boiler, the stearnis free to occupy the space e e e, in, around, and under the valve J in the case K, it

vpassing through atf, between the valve anddthe case, whiehjoint, though fitting snugly, is not packed, as the packing would prevent the valve from working freely by the pressure of the steam alone. lA flange, g, on the l upper portion of the valve, has a seat against the under side of the top of the case and above the case. The top of the valve is of the form shown in g. 2, it having radial ribs nwith open spaces between, so as to freely escape any steam that may pass the valve. rlhe case K is in two parts, the junction being at it'. This isfo'r the purpose of readily fitting the valve within the case. Under the valve J there is a coiled spring, j, which holds the valve up against its seat, when steam is first making, and before its pressure is sufficient .to hold=it up, and thus prevent it from leaking or wasting steam. And underneath the valve J there is also a plug, c, with a flange, m, on it, which serves to close an opening that the valve C is passed through to its seat, and may also serve as a gauge or guide to prevent the valve J from dropping too low, and willalso prevent the valve C from rising too high. The under part of the valve J is of an inverted cup-form, so as' to form a steam-chamber, the steam therein holding the valve closed against its scat. The upper portion L of' thc safety-valve is first con- Vtracted as at Z, so as to shield the openings H, that is to prevent them from being stopped from the exterior,

yet clear enough to allow the steam to pass freely through. Thenee it terminates in-a bell or trumpet-shaped top, as seen in the drawings. The steam from the boiler circulates in or occupies the space e', around the weight D, as it communicates directly with the boiler; and steam from the boiler occupies the space e, around the upper part ofthe valve-stemC, andjust below the valve, finding its' way there by two avenues-lint, by leaking past the valve-stem, which is not packed, but moves snugly and freely through the lower part of the case a; and secondly, by the openings, M, fig. 3, which 'are underneath the valve J, and communicate with the steamspace e, under and around said valve J, as heretofore mentioned. The valve C, it will be perceived, controlstho steam-space and shuts itoll` from the atmosphere, which is in the passages H. And when the valve C opens up into H, the interior of boiler and the steam-spaces are all in communication with the open air, and of course the steam escapes into the air, and when it is closed, the interior of the boiler and of the valve is shut off from the external air, and there is no escape. Whenthe pressure in the boiler is greater than that for which the weight D and the opening covered by the valve C is regulated for, the valve and weight will be llaised, and steam will escape and as the steam escapes from under the valve J, said valve will cushion down upon the steam, and open a passage between its flange g and the seat upon which it was pressed up, allowing the steam to escape thereat. When the pressure in the boiler is reduced to that for which the weight and valve are regulated, or a little below that pressure, the weight drops,the valve is closed, the steam from the boiler passes up into and through the case, and closes the valveJ as before. And thus thel safety-valve is self-acting, and cannot be tampered with bythe engineer, as, when put together, a wire and seal may be put into one of the screw-bolts B, and over or around its nut, so that the cover could not be removed to get at the interior without breaking the wire or seal.

Having thus fully described our mvention, whatwe claim therein as new, and desire to secure by Letters Patent', is-

i -1, The combination o f the weight and valve, when connected by a flexible `ioint, substantially as and for the purpose described.

V2. We also claim, in combination with the closed self-acting safety-valve, the valve J, which is held shut by the steam in the boiler when at 4or below its regulated pressure, and opened by the steam in the boiler when'its pressure rises above that which it is designed to carry, substantially as described.

3. We also claim, in combination with the passages H, the projecting top piece L, to prevent said passages from being stopped up, but at the same time allow the steam to escape through them when blown off through the safety-valve, as described.

4. W'e also claim the combination of the crank-shaft and lift-er with the weight D and valve C, so that the attendant can at any time open the safety-valve, and allow the steam from the boiler to pass through, b'ut` cannot close said valve to prevent the escape of steam when its pressure exceeds that for which thesafety-valve is HENRY- TAYLOR, J'. M. COALE.

computed, as set forth.

Witnesses:

A. B. STOUGHTON, EDM. F. BROWN. 

